The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In El Mirage you can figure out when it's possible to plant welsh onion by looking at the USDA zone info.

Planting Calendar for Welsh onion

Frost tolerance for welsh onion:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Since welsh onion are barely cold tolerant you can plant them a bit earlier in the year than other frost tender plants.

The earliest that you can plant welsh onion in El Mirage is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant welsh onion and expect a good harvest is probably September. If you wait any later than that and your welsh onion may not have a chance to grow to maturity. You can get started a little bit earlier by starting your welsh onion indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on February 15 in El Mirage. In the coldest months of winter you should expect an average low temperature of 25°F.

Since the USDA zone info for El Mirage is an average the actual date of last frost can change quite a bit from year to year. Half of the time in El Mirage there is a last frost after February 15 so make sure that you are ready to protect your welsh onion if you have a late frost.

USDA Zone Info for El Mirage

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in El Mirage

You may be interested in your other planting guides for El Mirage.